4 decide whether each of the following series converges or diverges ju
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4. Decide whether each of the following series converges or diverges. Justify your answers. \text { (a) } \sum_{n=1}^{\infty} \frac{5^{n} n !}{(3 n) !} \text { (b) } \sum_{n=2}^{\infty} \frac{2}{n(\ln